gistfile1.txt

import socket, sys

from twisted.internet.protocol import Factory, Protocol
from twisted.internet import reactor
from twisted.names import dns
from twisted.names import client, server
from twisted.python import log
from twisted.internet import defer
from twisted.names.common import ResolverBase

CHANGE = 'example.com'
TO = '127.0.0.1'
TTL = 60



class FakeResolver(client.Resolver):

	def _lookup(self, name, cls, qtype, timeout):
		"""
		The getHostByNameTest does a different type of query that requires it
		return an A record from an ALL_RECORDS lookup, so we accomodate that
		here.
		"""
		rr = dns.RRHeader(name=name, type=dns.A, cls=cls, ttl=60,
					payload=dns.Record_A(address='127.0.0.1', ttl=60))
		
		results = [rr]
		authority = []
		addtional = []
		return defer.succeed((results, authority, addtional))


verbosity = 0


resolver = FakeResolver(servers=[('4.2.2.2', 53)])
factory = server.DNSServerFactory(clients=[resolver], verbose=verbosity)
protocol = dns.DNSDatagramProtocol(factory)
factory.noisy = protocol.noisy = verbosity
log.startLogging(sys.stdout)
reactor.listenUDP(53, protocol)
reactor.listenTCP(53, factory)
reactor.run()